Boscawen-Ûn (grid reference SW412273) is a Bronze Age stone circle close to St Buryan in Cornwall, UK.

An old Welsh triad mentions one of the three principal gorseddau of the Island of Britain as "Beisgawen yn Nyfnwal" (Boscawen in Dumnonia), which was taken to refer to Boscawen-Ûn by the Gorseth's founders.

[1] That Welsh triad dates to only the 18th century when it was made up by Iolo Morganwg, Edward Williams.

[2] Boscawen-Un is in southwest Cornwall, in the Penwith district north of St Buryan, by the A30 road from Penzance to Land's End.

[3] Boscawen-Un is a Cornish name, from the words bos (farmstead) and scawen (elder or elderberry tree).

The circle has been aligned with the rising winter solstice sun from the Lamorna Gap.

Camden does not mention the central stone leaning at an angle but in 1749 William Stukeley thought it may have been disturbed by someone looking for treasure.

From this time originates one of the first illustrations of the stone circle, which John Thomas Blight made, when he wrote a book concerning the churches of Cornwall with notes concerning ancient monuments.